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Moving to asia then? That's where most heat pumps are assembled. Not much difference between brands besides the covers. Maybe 3 manufacturing companies pretty much same branded name parts.
Difference between heat pump and typical A/C is a 4 way valve and a different control board to switch that valve but could be done old school. Valve can be had for car use, costs under $200 American, controller maybe $20 so under $250. Efficiency is related to freon choice and system pressure plus how much radiator you have to gain or remove heat
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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